How to recover deleted iPhoto library?

I am using Macbook Air and accidentally i deleted "iPhoto Library" icon from the "Pictures" folder, which resulted in deletion of all my pictures in iPhoto even from the trash. Is there any way i could recover my deleted photos? Earlier pictures were taking 40GB of hard and 50gb under title"Others". But now after deletion space taken by pictures is 0gb and space taken by "Others" is 90GB.